From Cppreference
Returns output position indicator of the current associated streambuf object.
Essentially calls rdbuf()->pubseekoff(0, std::ios_base::cur, std::ios_base::out).
Parameters
(none)
Return value
current output position indicator on success, -1 if a failure (fail() != false) occurs.
Example
See also
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| sets the output position indicator (public member function)
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| returns the input position indicator (public member function of std::basic_istream)
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| sets the input position indicator (public member function of std::basic_istream)
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